Presence of biotoxin leads to closure of parts of Shinnecock Bay and areas near Southold

Shellfish lovers clamoring for an early clambake beware: Some parts of Long Island’s Shinnecock Bay and areas near Southold, N.Y., have been closed to shellfish harvesting due to the presence of a dangerous biotoxin that, if consumed, can be fatal.

On Thursday, the New York State Department of Environmental Conservation closed some 1,400 acres of the western Shinnecock Bay in Suffolk County from the harvesting of clams, oysters,...